<!DOCTYPE html>
<!--
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<html><head>
  <meta charset="utf-8">
  <title>Reference: Clamp 'automatic minimum size' to definite max-sizing for items with specified intrinsic 'width'/'height'</title>
  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1300369">
  <style type="text/css">
body,html { color:black; background:white; font:16px/1 monospace; padding:0; margin:0; }

.grid {
  display: grid;
  float: left;
  position: relative;
  grid-template-columns: repeat(2,20px);
  grid-template-rows: repeat(2,20px);
  align-items: start;
  justify-items: start;
  border: 1px dashed;
  margin-right: 16px;
  margin-bottom: 14px;
}
.c-auto { grid-template-columns: 15px; width: 15px; }
.c-min { grid-template-columns: 15px; width: 15px; }
.c-max { grid-template-columns: 15px; width: 15px; }
.c-1530 { grid-template-columns: 15px; width: 30px; }
.c-30 { grid-template-columns: 30px; width: 30px; }
.r-auto { grid-template-rows: 15px; height: 15px; }
.r-min { grid-template-rows: 15px; height: 15px; }
.r-max { grid-template-rows: 15px; height: 15px; }
span {
  grid-area: 1 / 1;
  font-size: 48px;
  background: grey;
}
y {
  position: absolute;
  grid-area: 2 / 1 / 3 / 2;
  top:0;left:0;right:0;
  height: 10px;
  background: lightgrey;
}
.r y {
  grid-area: 1 / 2 / 2 / 3;
  top:0;bottom:0;left:0;
  width: 10px;
  height: auto;
}
br { clear: both; }

x { display:block; width:30px; height:40px; }
span { width:15px; }
.r span { width:20px; }
.grid.c-30 span, .r.grid.c-30 span { width:30px; }
.r span { height:15px; }
  </style>
</head>
<body>

<div class="grid c-1530"><y></y><span><x>X</x></span></div>
<div class="grid c-auto"><y></y><span><x>X</x></span></div>
<div class="grid c-30"><y style="width:30px"></y><span><x>X</x></span></div>
<div class="grid c-1530"><y></y><span><x>X</x></span></div>
<div class="grid c-1530"><y></y><span><x>X</x></span></div>

<br>

<div class="grid c-min"><y></y><span><x>X</x></span></div>
<div class="grid c-min"><y></y><span><x>X</x></span></div>
<div class="grid c-30" style="width:30px"><y style="width:30px"></y><span><x>X</x></span></div>
<div class="grid c-min"><y></y><span><x>X</x></span></div>
<div class="grid c-min"><y></y><span><x>X</x></span></div>

<br>

<div class="grid c-30"><y></y><span><x>X</x></span></div>
<div class="grid c-max"><y></y><span><x>X</x></span></div>
<div class="grid c-30"><y></y><span><x>X</x></span></div>
<div class="grid c-30"><y></y><span><x>X</x></span></div>
<div class="grid c-30"><y></y><span><x>X</x></span></div>

<br>

<div class="grid r r-auto"><y></y><span><x>X</x></span></div>
<div class="grid r r-auto"><y></y><span><x>X</x></span></div>
<div class="grid r r-auto"><y></y><span><x>X</x></span></div>
<div class="grid r r-auto"><y></y><span><x>X</x></span></div>
<div class="grid r r-auto"><y></y><span><x>X</x></span></div>

<br>

<div class="grid r r-min"><y></y><span><x>X</x></span></div>
<div class="grid r r-min"><y></y><span><x>X</x></span></div>
<div class="grid r r-min"><y></y><span><x>X</x></span></div>
<div class="grid r r-min"><y></y><span><x>X</x></span></div>
<div class="grid r r-min"><y></y><span><x>X</x></span></div>

<br>

<div class="grid r r-max"><y></y><span><x>X</x></span></div>
<div class="grid r r-max"><y></y><span><x>X</x></span></div>
<div class="grid r r-max"><y></y><span><x>X</x></span></div>
<div class="grid r r-max"><y></y><span><x>X</x></span></div>
<div class="grid r r-max"><y></y><span><x>X</x></span></div>

<br>

<div class="grid r c-min r-auto"><y></y><span><x>X</x></span></div>
<div class="grid r c-min r-auto"><y></y><span><x>X</x></span></div>
<div class="grid r c-30 r-auto"><y></y><span><x>X</x></span></div>
<div class="grid r c-min r-auto"><y></y><span><x>X</x></span></div>
<div class="grid r c-min r-auto"><y></y><span><x>X</x></span></div>

<br>

<div class="grid r c-min r-min"><y></y><span><x>X</x></span></div>
<div class="grid r c-min r-min"><y></y><span><x>X</x></span></div>
<div class="grid r c-30 r-min"><y></y><span><x>X</x></span></div>
<div class="grid r c-min r-min"><y></y><span><x>X</x></span></div>
<div class="grid r c-min r-min"><y></y><span><x>X</x></span></div>

<br>

<div class="grid r c-min r-max"><y></y><span><x>X</x></span></div>
<div class="grid r c-min r-max"><y></y><span><x>X</x></span></div>
<div class="grid r c-30 r-max"><y></y><span><x>X</x></span></div>
<div class="grid r c-min r-max"><y></y><span><x>X</x></span></div>
<div class="grid r c-min r-max"><y></y><span><x>X</x></span></div>

<br>

<div class="grid r c-30 r-auto"><y></y><span><x>X</x></span></div>
<div class="grid r c-max r-auto"><y></y><span><x>X</x></span></div>
<div class="grid r c-30 r-auto"><y></y><span><x>X</x></span></div>
<div class="grid r c-30 r-auto"><y></y><span><x>X</x></span></div>
<div class="grid r c-30 r-auto"><y></y><span><x>X</x></span></div>

<br>

<div class="grid r c-30 r-min"><y></y><span><x>X</x></span></div>
<div class="grid r c-max r-min"><y></y><span><x>X</x></span></div>
<div class="grid r c-30 r-min"><y></y><span><x>X</x></span></div>
<div class="grid r c-30 r-min"><y></y><span><x>X</x></span></div>
<div class="grid r c-30 r-min"><y></y><span><x>X</x></span></div>

<br>

<div class="grid r c-30 r-max"><y></y><span><x>X</x></span></div>
<div class="grid r c-max r-max"><y></y><span><x>X</x></span></div>
<div class="grid r c-30 r-max"><y></y><span><x>X</x></span></div>
<div class="grid r c-30 r-max"><y></y><span><x>X</x></span></div>
<div class="grid r c-30 r-max"><y></y><span><x>X</x></span></div>

</body></html>
